论文标题
掺杂的钙钛矿纳米晶体中载体定位的机理，以进行明亮的发射
Mechanism of carrier localization in doped perovskite nanocrystals for bright emission
论文作者
论文摘要
基于金属大甲基钙钛矿的纳米晶体为高效照明提供了有希望的材料平台。使用瞬态光谱法，我们研究了锰掺杂的CSPB（CL，BR）3钙钛矿纳米晶体中的激发重组动力学。我们发现掺杂时固有的激发辐射重组率有所增加，这通常是量身定制的具有挑战性的材料特性。在从头算计算的支持下，我们可以将增强的排放率归因于通过晶格周期性从MN掺杂剂中断的激子定位，从而增加了激子的有效质量以及电子和孔波函数的重叠，从而增加了振荡器的强度。我们关于提高钙钛矿纳米晶体发光效率的基本策略的报告对于最大程度地提高发光应用的效率是有价值的。
Nanocrystals based on metal-halide perovskites offer a promising material platform for highly efficient lighting. Using transient optical spectroscopy, we study excitation recombination dynamics in manganese-doped CsPb(Cl,Br)3 perovskite nanocrystals. We find an increase in the intrinsic excitonic radiative recombination rate upon doping, which is typically a challenging material property to tailor. Supported by ab initio calculations, we can attribute the enhanced emission rates to increased exciton localization through lattice periodicity breaking from Mn dopants, which increases exciton effective masses and overlap of electron and hole wavefunctions and thus the oscillator strength. Our report of a fundamental strategy for improving luminescence efficiencies in perovskite nanocrystals will be valuable for maximizing efficiencies in light-emitting applications.
